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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
Bicarbonate ions buffer acidity and help to maintain healthy pH levels in fluids, especially your blood. Over-use of medications and excessive consumption of coffee, black tea or sodas can lead to acidic conditions in your tissues.